题干

由1分子磷酸、1分子碱基和1分子a构成了化合物b,如图所示,则下列叙述不正确的是(    )

A:组成化合物b的元素有C,H,O,N,P五种

B:a属于不能水解的糖,是构成生物体的重要成分

C:若a为核糖,则由b组成的核酸主要分布在细胞质中

D:幽门螺杆菌体内含的化合物m共四种

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D

同类题4

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Many musicians meet and form(组成)a band because they like to write and play their own music. They may start as a group of high school students and practice their music in someone's house. Sometimes they may play to passers—by in the street or subway so that they can get some money for themselves or pay for their instruments (乐器).

    However, there was one band that started in a different way. It was called the Monkees and was formed in 1965. It began as a TV show. The TV show had planned to find four rock musicians who could act as well as sing. But they could only find one who was good enough. They had to use actors for the other three members of the band.

    Since some of these actors could not sing well enough,they had to ask for help from other musicians. So at first,the band just pretended (假装)to sing. Anyway,their performances were excellent and they got lots of fans. Each week on TV,the Monkees would pretended to play and sing songs written by other musicians. After a year or so,they became more serious about their work. They started to play and sing their own songs like a real band. Then they produced(制作)their own records and started touring and playing their own music. In the USA they became even more influential and popular than the Beatles and sold even more records.

    However, the band broke up around 1970,but happily they reunited(重聚)in the 1980s. They produced a new record in 1996 to celebrate their time as a band. It was very successful. Today the Monkees are still making music for their millions of fans.